The document discusses the world's oceans, including that 71% of the Earth is covered in ocean water. It outlines the five major oceans - Arctic, Antarctic, Atlantic, Indian, and Pacific. While there were historically seven seas, there are now five major oceans. The oceans are economically and ecologically important, providing food/resources for humans while containing millions of undiscovered species. The 2010 Deepwater Horizon oil spill in the Gulf of Mexico released around 185 million gallons of crude oil, causing extensive damage to wildlife and their habitats. The full consequences of the spill may not be understood for years.